This patchset updates devfreq core to add support for devices which can idle. When device idleness is detected perhaps through runtime-pm, need some mechanism to suspend devfreq load monitoring and resume when device is back online.
patch 1 introduce core design changes - per device work, decouple delayed work from core and event based interaction. patch 2 add devfreq suspend and resume apis. patch 3 add new sysfs attribute for governor predicted next target frequency and callback for current device frequency.
The existing devfreq apis are kept intact. Two new apis devfreq_suspend_device() and devfreq_resume_device() are added to support suspend/resume of device devfreq.
Changes since v1: - revised locking mechanism - added kerneldoc comments for load monitoring helper functions - Fixed minor review comments
Changes since v2: - added new helper function for polling interval update - Handled work suspend/resume contention between devfreq driver and sysfs
-- Rajagopal Venkat (3): devfreq: Core updates to support devices which can idle devfreq: Add suspend and resume apis devfreq: Add current freq callback in device profile
Documentation/ABI/testing/sysfs-class-devfreq | 15 +- drivers/devfreq/devfreq.c | 469 ++++++++++++-------------- drivers/devfreq/governor.h | 13 + drivers/devfreq/governor_performance.c | 16 +- drivers/devfreq/governor_powersave.c | 16 +- drivers/devfreq/governor_simpleondemand.c | 33 ++ drivers/devfreq/governor_userspace.c | 23 +- include/linux/devfreq.h | 49 +-- 8 files changed, 341 insertions(+), 293 deletions(-)